S-93882A578 5/16"-18 x 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding industrial environments
• Enhanced torque transmission through external hex drive design, preventing tool slippage during installation
• Efficient thread forming capability creates strong, permanent threads in metal substrates without chip removal
• Integrated flange design provides wider bearing surface for improved load distribution and vibration resistance
• Full threading along entire shank length ensures maximum grip strength and uniform stress distribution
• Versatile material compatibility with steel, aluminum, brass, cast iron, and sheet metal applications
• Coarse UNC thread pattern enables faster installation and superior performance in softer metals

Professional Applications & Engineering Value

These 5/16"-18 UNC thread forming tapping screws deliver exceptional engineering value in metal fabrication and assembly operations. The zinc-plated steel construction provides reliable corrosion protection while maintaining high tensile strength for structural applications. The thread forming design eliminates the need for pre-tapped holes, creating precise mating threads through material displacement rather than cutting. This results in zero chip generation, making them ideal for electrical enclosures, machinery assemblies, and automotive components where debris contamination must be avoided. The flanged hex head combines the installation efficiency of external drive systems with the stability of an integrated washer, reducing assembly time while providing superior clamp force. These characteristics make these metal tapping screws particularly valuable in high-volume production environments requiring consistent, reliable fastening performance across diverse metal substrates.

Specification Summary & Compliance

Manufactured to precise UNC coarse thread standards with 5/16"-18 thread size and Class 2A tolerance for consistent fit and performance. The screws feature full threading along the entire 1/2" length with blunt tip design optimized for thread forming applications. Requires 0.281" (7.1 mm) drill bit size for proper hole preparation. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met for industrial applications.